Notes: The set rating is calculated in inverse order. For example, PO-1 = 70 and MS/PR-70 = 1. We have put weights in the Morgan dollar Low Ball set. This is a relatively “new” market and Set Registry concept so the weights should be taken with a grain of salt. As more coins are submitted in the next few years, we will have a better idea of true rarity in the lowest grades. We will examine the weights a year from now and most probably make adjustments to the weights.